<template>
  <el-container class="home_container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="" alt="picture">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域保存-->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板-->
            <template slot="title">
              <!--图标-->
              <i class="el-icon-location"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
              <!--二级菜单-->
              <el-menu-item @click="saveNavState('/'+subitem.path)" :index="'/'+subitem.path" v-for="subitem in item.children" :key="subitem.id">
                <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subitem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧内容-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      isCollapse: false,
      // 被激活的连接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      console.log(res)
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮，实现菜单的折叠和展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .el-header{
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0px;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }
  .el-aside{
    background-color: #373D41;
    .el-menu{
      border-right: none;
    }
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
  .el-main{
    background-color: #eaedf1;
  }
  .home_container{
    height: 100%;
  }
</style>
